At a certain temperature, Kc = 0.18 for the equilibrium PCl3(g) + Cl2(g) PCl5(g)

Question

At a certain temperature, Kc = 0.18 for the equilibrium

PCl3(g) + Cl2(g) PCl5(g)

Suppose a reaction vessel at this temperature contained these three gases at the following concentrations:

[PCl3] = 0.0420 M

[Cl2] = 0.0240 M

[PCl5] = 0.00500 M

Compute the reaction quotient and use it to determine whether the system is in a state of equilibrium. If the system is not at equilibrium, in which direction will the reaction proceed to get to equilibrium?

Q =????

This ?(is) ? or ? (is not)? the value of the equilibrium constant, and we conclude that the system    ? (is) ? or ? (is not)? at equilibrium.

Since the value of the reaction quotient for this system is   ? (larger than that of) ? or ? (smaller than that of) ? or ? (identical to)? the equilibrium constant, the system must

Explanation / Answer

PCl3(g) + Cl2(g) --- > PCl5(g)

[PCl3] = 0.0420 M

[Cl2] = 0.0240 M

[PCl5] = 0.00500 M

the reaction quotient Q = [PCl5]/[PCl3][Cl2]

Q= 0.00500/0.0420*0.0240

Q= 4.96

When Q>K, there are more products than reactants.

Q, 4.96> Kc 0.18

Thus the reaction goes in forward direction.

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